Mailing list is a list of mail addresses of people. They may have interest in the same topic, or join the same group. When a member send a message to this group, all members will receive it.
For webmaster, mailing list is a list of all the subscribers to the website, where the same information is being sent. It is better to allow your subscriber to choose what method they prefer to receive mail from the list server: individually as they are received from the list server, or in digest form where the messages received on the specific day.
Discussion list is one of electronic mailing list types. Your subscriber can send messages to the other members, where the information exchanges and actual discussion happen. Only the one who has subscribed can post directly in the discussion list.
It may takes times to compile this list. You may need to consider using affordable and professional business mailing lists for advertising purpose. Business mailing lists can help you to find the targeted prospect to maximize your profit and achieve your marketing goals. If you have 10,000 mailing lists, try to divide theme and using difference codes to track which one generates the best result.
Good tips here, I especially thought that the discussion list point is a great way to get customer feedback and get customers involved. Additionally, great tip about dividing themes to see what works best. Definitely a great idea.